[Possible NSFW] I believe my fish is dying from fin and tail

Is this early signs of fin rot?

Is this fin rot ?

Is this fin rot ?

Fin rot/ behavior?

Need HELP fin damage or rot ?

Black moor, fin rot?

Treatment for fin rot

Is my gold fish okay? He turned white quite fast. He has a blemish

What’s wrong with my goldfish’s tail fin?

What’s wrong with my buddy’s tail fin?

What’s wrong with my fish’s tail fin?